Disable Fast Startup and the built-in battery. . . . 51
Replace a CRU . . . . . . . . . . . . . . . 52
Base cover assembly (for T490 and P43s
only) . . . . . . . . . . . . . . . . . 52
Base cover assembly (for T590 and P53s
only) . . . . . . . . . . . . . . . . . 54
Memory module (for selected models) . . . . 56
M.2 solid-state drive . . . . . . . . . . . 57
Coin-cell battery. . . . . . . . . . . . . 60
Wireless WAN card (for selected models) . . . 62
Keyboard . . . . . . . . . . . . . . . 65
Speaker assembly . . . . . . . . . . . . 71
Always On USB 3.1 connector Gen 1 board . . 73
Chapter 8. Help and support . . . . . 75
Frequently asked questions . . . . . . . . . . 75
Error messages . . . . . . . . . . . . . . . 76
Beep errors . . . . . . . . . . . . . . . . 77
Self-help resources . . . . . . . . . . . . . 78
Call Lenovo . . . . . . . . . . . . . . . . 79
Before you contact Lenovo . . . . . . . . 79
Lenovo Customer Support Center . . . . . . 80
Purchase additional services. . . . . . . . . . 81
Appendix A. Important safety
information . . . . . . . . . . . . . . . 83
Appendix B. Accessibility and
ergonomic information . . . . . . . . 97
Appendix C. Supplemental
information about the Ubuntu operating
system . . . . . . . . . . . . . . . . . 101
Appendix D. Compliance
information . . . . . . . . . . . . . . . 103
Appendix E. Notices and
trademarks . . . . . . . . . . . . . . . 117
ii T490, T590, P43s, and P53s User Guide